Zone 1 looks back at the pioneer age of telephony from 1881 to 1927 :
The first telephone of 1881, wall phones with receivers and voice amplifier tubes or carbon microphones with moveable contacts are among the objects in this zone.
Zone 2 presents the time up until 1972:
www.a1.netZone 1 blickt in die Pionierzeit der Telefonie von 1881 bis 1927 zurück :
Das erste Telefon von 1881, Wandapparate mit Hör- und Sprechschläuchen oder Kohlemikrofone mit beweglichen Kontakten gehören zu den Exponaten dieser Zone.
Zone 2 präsentiert die Zeit bis 1972:
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